A device for preparing metallic arsenic

Abstract

The utility model discloses a metal arsenic preparation device, which comprises an air compressor, a dryer, a batching granulator and a dust collector. The air outlet of the air compressor is connected to the batching granulator and the dust collector through a pipeline, and a conveyor belt is arranged between the material outlet of the dryer and the material inlet of the batching granulator. The metal arsenic preparation device can dry calcium arsenate salt and then add a reducing agent for mixing and granulation by arranging the dryer and the batching granulator. The metal arsenic preparation device can control the vacuum degree in the reduction furnace by arranging a vacuum pump to connect the reduction furnace. The metal arsenic preparation device can obtain arsenic vapor after the prepared granules are placed in the reduction furnace for reaction by arsenic furnace, and then the arsenic vapor is cooled and crystallized by a condenser to obtain metal arsenic. The operation process is simple and convenient, the effect of preparing metal arsenic is good, metal arsenic with an arsenic content of ≥95% can be prepared in one step, the direct yield of arsenic production is high, the arsenic content in slag is low, and the device is suitable for industrial-scale production.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting and environmental protection, in particular to a metal arsenic preparation device. Background Art

[0002] my country is a major producer of antimony. During the refining of antimony, a large amount of arsenic-alkali slag is produced. After the arsenic-alkali slag is leached and separated, the slag contains a large amount of arsenate. There has been no good environmentally friendly method for the disposal of arsenate in China. Some people extract sodium arsenate to make glass clarifiers for product takeaway, some make cement bricks after arsenic precipitation through calcification, some landfill, etc., but all these processed products have the problem of secondary pollution. For arsenic, trivalent materials are highly toxic, and pentavalent materials are toxic, but far less than trivalent materials. In the era when environmental protection requirements were not very strict, sodium arsenate was produced as a product for the glass clarification industry. Arsenic solidified in glass should be more ideal. However, the use of glass products may cause harm to humans and animals. Therefore, sodium arsenate is sealed as a glass clarifier. Sodium arsenate has also become a secondary pollutant, which is not allowed by environmental protection. Another way is to calcify sodium arsenate into calcium arsenate precipitation, mix it with cement to make bricks, and use it for underground filling. Long-term immersion in the underground may have the problem of failing the toxic leaching test, and it is not allowed to be adopted. If arsenic materials are to be completely harmless, there is only one way left, which is to prepare elemental metallic arsenic. Elemental metallic arsenic is harmless, can be used as a product, can be stored, and is greatly concentrated. There are many companies in China that use arsenic trioxide to make arsenic, but the environment is not protected, it is very harmful to the operators, and the recovery rate is low. This method has not been well promoted in China. With the breakthrough of key technologies for the comprehensive recycling and utilization of antimony, arsenic, and alkali cascades in the national key project of antimony refining arsenic alkali slag, the era of truly harmless arsenic materials has arrived, that is, the breakthrough of arsenic salt direct one-step reduction technology to make arsenic.

[0003] To this end, we design a metallic arsenic preparation device here. Utility Model Content

[0004] The purpose of the utility model is to provide a metal arsenic preparation device to solve the problems raised in the background technology in view of the shortcomings of the prior art.

[0005] To achieve the above object, the utility model provides the following technical solution: a metal arsenic preparation device, the device comprising an air compressor, a dryer, a batching granulator and a dust collector, the air outlet of the air compressor is connected to the batching granulator and the dust collector through a pipeline, and a conveyor belt is arranged between the discharge port of the dryer and the feed port of the batching granulator;

[0006] The device also includes a reduction furnace, a condenser, a vacuum pump, a hydraulic lift and a water cooling system. The hydraulic lift is arranged below the reduction furnace, the inlet of the condenser is connected to the outlet of the reduction furnace through a pipeline, the outlet of the condenser is connected to the dust collector through a pipeline, the vacuum pump is connected to the reduction furnace through a pipeline, and the water cooling system is connected to the furnace body and furnace cover of the reduction furnace through a pipeline.

[0007] Preferably, the dryer is an electric heating dryer or a natural gas heating dryer.

[0008] Preferably, the batching granulator is a rotary batching granulator.

[0009] Preferably, the reduction furnace is a vacuum reduction furnace.

[0010] Preferably, the condenser is a graphite condenser.

[0011] Compared with the prior art, the utility model provides a metal arsenic preparation device, which has the following beneficial effects:

[0012] The metal arsenic preparation device can dry calcium arsenate and then add a reducing agent to mix and granulate after the drying of the calcium arsenate. The metal arsenic preparation device can control the vacuum degree in the reduction furnace by arranging a vacuum pump to connect the reduction furnace. The metal arsenic preparation device can obtain arsenic vapor after the prepared granules are placed in the reduction furnace for reaction by arsenic preparation by arranging the reduction furnace, and then the arsenic vapor is cooled and crystallized by a condenser to obtain metal arsenic. The operation process is simple and convenient, the effect of preparing metal arsenic is good, metal arsenic with an arsenic content of ≥95% can be prepared in one step, the direct yield of arsenic production is high, the arsenic content in slag is low, and the device is suitable for industrial-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure numerals: 1. air compressor; 2. dryer; 3. batching granulator; 4. reduction furnace; 5. condenser; 6. dust collector; 7. vacuum pump; 8. hydraulic lift; 9. water cooling system. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1In this embodiment: a metal arsenic preparation device, the device comprises an air compressor 1, a dryer 2, a batching granulator 3 and a dust collector 6, the air outlet of the air compressor 1 is connected to the batching granulator 3 and the dust collector 6 through a pipeline, the function of the air compressor 1 is to provide air volume for the batching granulator 3 and to provide air volume for blowing and back-blowing for the dust collector 6, a conveyor belt is arranged between the discharge port of the dryer 2 and the feed port connected to the batching granulator 3, the dryer 2 uses an electric heating dryer or a natural gas heating dryer, the batching granulator 3 uses a rotary batching granulator, after the raw material is poured from the inlet of the dryer 2, the raw material can be dried by the dryer 2, the dried raw material can enter the batching granulator 3 through the conveyor belt after coming out of the discharge port of the dryer, a metered reducing agent is added to the batching granulator 3, and the reducing agent and the dried raw material can be mixed and granulated by the batching granulator 3;

[0017] The device also includes a reduction furnace 4, a condenser 5, a vacuum pump 7, a hydraulic lift 8 and a water cooling system 9. The reduction furnace 4 uses a vacuum reduction furnace. The furnace body and the furnace cover of the reduction furnace 4 are double-layer stainless steel materials with jacket water cooling. The reduction furnace 4 has a built-in crucible heater. The hydraulic lift 8 is arranged below the reduction furnace 4. After the prepared particles are loaded into the crucible, the crucible is placed on the lifting platform of the hydraulic lift 8. The crucible can be moved to the bottom of the entrance of the reduction furnace 4 by moving the hydraulic lift 8. The entrance at the bottom of the reduction furnace 4 is opened, and the crucible can be pushed into the reduction furnace 4 by the hydraulic lift 8. The condenser 5 uses a graphite condenser. The inlet of the condenser 5 is connected to the outlet of the reduction furnace 4 through a pipeline. After the raw materials in the reduction furnace 4 react, the arsenic vapor can enter the condenser 5, and then condense and crystallize in the condenser 5. The condenser 5 The outlet is connected to the dust collector 6 through a pipeline. The dust collector 6 is a high-temperature bag dust collector at the front end and a sintered plate dust collector at the rear end. The dust collector 6 has built-in air forward and reverse blowing equipment. The dust collector 6 is used to collect dust from the exhaust gas discharged from the condenser 5 and then discharge the exhaust gas. The vacuum pump 7 is connected to the reduction furnace 4 through a pipeline. The vacuum pump 7 is used to evacuate the reduction furnace 4. The selection of the vacuum pump 7 must ensure that the vacuum degree of the vacuum pump 7 reaches 80-90kPa. The water cooling system 9 is connected to the furnace body and the furnace cover of the reduction furnace 4 through a pipeline. The water cooling system 9 includes a cooler and a water pump. The water cooling system 9 can provide cooling water to the reduction furnace 4. The cooling water can enter the interlayer between the furnace body and the furnace cover of the reduction furnace 4 to cool and protect the reduction furnace 4. The hot water will return to the cooler in the water cooling system 9 for air cooling and then circulate under the action of the water pump.

[0018] The working principle and use process of the utility model are as follows: firstly, the calcium arsenate salt after the arsenic-alkali separation pressing plate is sampled to measure water and arsenic, and then the sample is sent to the dryer 2 by measurement. After the raw material is dried, it enters the batching granulator 3 through the conveyor belt, the air compressor 1 is started, the weight of the reducing agent required for the reaction is calculated, the reducing agent is poured into the batching granulator 3, the batching granulator 3 is used for mixing and granulating, the prepared granules are loaded into the reaction crucible, and the crucible is placed on the hydraulic lift 8, the hydraulic lift 8 is moved to make the crucible below the entrance of the reduction furnace 4, the entrance at the bottom of the reduction furnace 4 is opened, the hydraulic lift 8 is started, the crucible is pushed into the reduction furnace 4 from the entrance, and locked. The inlet of the reduction furnace 4 is sealed, the water cooling system 9 and the vacuum pump 7 are turned on, the dust collector 6 is purged forward and backward, and then the reduction furnace 4 is turned on for heating and heating. After the temperature reaches 1100°C, the temperature is maintained constant. The arsenic vapor obtained in the reduction furnace 4 will enter the condenser 5 and be cooled and crystallized on the baffle crystallization plate in the condenser 5 until the reaction is completed. The reduction furnace 4 is turned off until the reduction furnace 4 is cooled to 80°C, the vacuum pump 7 is turned off to reduce the pressure to 0, the water cooling system 9 is turned off, the forward and reverse purge of the dust collector is turned off, the reduction furnace 4 is turned on to take out the crucible, the slag is poured out, the side of the condenser 5 is opened, the baffle crystallization plate is taken out, and the crystallized product metallic arsenic is obtained.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A metallic arsenic preparation device, characterized in that: The device comprises an air compressor (1), a dryer (2), a batching granulator (3) and a dust collector (6); the air outlet of the air compressor (1) is connected to the batching granulator (3) and the dust collector (6) via a pipeline; a conveyor belt is arranged between the discharge port of the dryer (2) and the feed port of the batching granulator (3); The device further comprises a reduction furnace (4), a condenser (5), a vacuum pump (7), a hydraulic lift (8) and a water cooling system (9); the hydraulic lift (8) is arranged below the reduction furnace (4); the inlet of the condenser (5) is connected to the outlet of the reduction furnace (4) via a pipeline; the outlet of the condenser (5) is connected to the dust collector (6) via a pipeline; the vacuum pump (7) is connected to the reduction furnace (4) via a pipeline; and the water cooling system (9) is connected to the furnace body and furnace cover of the reduction furnace (4) via a pipeline.

2. A metallic arsenic preparation device according to claim 1, characterized in that: The dryer (2) is an electric heating dryer or a natural gas heating dryer.

3. The metallic arsenic preparation device according to claim 1, characterized in that: The batching granulator (3) uses a rotary batching granulator.

4. The metallic arsenic preparation device according to claim 1, characterized in that: The reduction furnace (4) uses a vacuum reduction furnace.

5. The metallic arsenic preparation device according to claim 1, characterized in that: The condenser (5) uses a graphite condenser.

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